diff --git parse.y parse.y
index 362dea7..c0fae83 100644
--- parse.y
+++ parse.y
@@ -9368,7 +9368,6 @@ shadowing_lvar_0(struct parser_params *parser, ID name)
 	    yyerror("duplicated argument name");
 	}
 	else if (dvar_defined_get(name) || local_id(name)) {
-	    rb_warning1("shadowing outer local variable - %"PRIsWARN, rb_id2str(name));
 	    vtable_add(lvtbl->vars, name);
 	    if (lvtbl->used) {
 		vtable_add(lvtbl->used, (ID)ruby_sourceline | LVAR_USED);
diff --git test/lib/test/unit/assertions.rb test/lib/test/unit/assertions.rb
index 91532e8..fdc2974 100644
--- test/lib/test/unit/assertions.rb
+++ test/lib/test/unit/assertions.rb
@@ -646,6 +646,16 @@ def assert_warn(*args)
         assert_warning(*args) {$VERBOSE = false; yield}
       end
 
+      def assert_no_warning(pat, msg = nil)
+        stderr = EnvUtil.verbose_warning {
+          EnvUtil.with_default_internal(pat.encoding) {
+            yield
+          }
+        }
+        msg = message(msg) {diff pat, stderr}
+        refute(pat === stderr, msg)
+      end
+
       def assert_no_memory_leak(args, prepare, code, message=nil, limit: 2.0, rss: false, **opt)
         require_relative '../../memory_status'
         raise MiniTest::Skip, "unsupported platform" unless defined?(Memory::Status)
diff --git test/ripper/test_parser_events.rb test/ripper/test_parser_events.rb
index 540d36e..65c0509 100644
--- test/ripper/test_parser_events.rb
+++ test/ripper/test_parser_events.rb
@@ -1321,13 +1321,6 @@ def test_invalid_global_variable_name
     assert_equal("`$' without identifiers is not allowed as a global variable name", compile_error('$'))
   end
 
-  def test_warning_shadowing
-    fmt, *args = warning("x = 1; tap {|;x|}")
-    assert_match(/shadowing outer local variable/, fmt)
-    assert_equal("x", args[0])
-    assert_match(/x/, fmt % args)
-  end
-
   def test_warning_ignored_magic_comment
     fmt, *args = warning("1; #-*- frozen-string-literal: true -*-")
     assert_match(/ignored after any tokens/, fmt)
diff --git test/ruby/test_parse.rb test/ruby/test_parse.rb
index eca1744..d9b79a3 100644
--- test/ruby/test_parse.rb
+++ test/ruby/test_parse.rb
@@ -854,10 +854,8 @@ def test_method_block_location
     assert_equal(expected, actual, bug5614)
   end
 
-  def test_shadowing_variable
-    assert_warning(/shadowing outer local variable/) {eval("a=1; tap {|a|}")}
-    a = "\u{3042}"
-    assert_warning(/#{a}/o) {eval("#{a}=1; tap {|#{a}|}")}
+  def test_no_shadowing_variable_warning
+    assert_no_warning(/shadowing outer local variable/) {eval("a=1; tap {|a|}")}
   end
 
   def test_unused_variable
diff --git test/ruby/test_rubyoptions.rb test/ruby/test_rubyoptions.rb
index 2e5f76d..8e33255 100644
--- test/ruby/test_rubyoptions.rb
+++ test/ruby/test_rubyoptions.rb
@@ -654,20 +654,6 @@ def test_unused_variable
     assert_in_out_err(["-w", "-"], "eval('a=1')", [], [], feature7730)
   end
 
-  def test_shadowing_variable
-    bug4130 = '[ruby-dev:42718]'
-    assert_in_out_err(["-we", "def foo\n""  a=1\n""  1.times do |a| end\n""  a\n""end"],
-                      "", [], ["-e:3: warning: shadowing outer local variable - a"], bug4130)
-    assert_in_out_err(["-we", "def foo\n""  a=1\n""  1.times do |a| end\n""end"],
-                      "", [],
-                      ["-e:3: warning: shadowing outer local variable - a",
-                       "-e:2: warning: assigned but unused variable - a",
-                      ], bug4130)
-    feature6693 = '[ruby-core:46160]'
-    assert_in_out_err(["-we", "def foo\n""  _a=1\n""  1.times do |_a| end\n""end"],
-                      "", [], [], feature6693)
-  end
-
   def test_script_from_stdin
     begin
       require 'pty'